Dow Jones industrial average breaks through 20,000 milestone

The Dow Jones industrial average crossed the 20,000 mark for the first time Wednesday, the latest milestone in a record-setting drive for the stock market.Strong earnings from Boeing and other big companies helped push the Dow past the threshold early on. U.S. stocks closed solidly higher, lifting the Standard & Poor's 500 index and Nasdaq composite to record highs of their own for the second day in a row.Banks and other financial companies led the gainers, which included technology and indu